Electric stove.



J, W. PURNELL.

ELECTRIC STOVE.

A1 1 L1CAT10N .FILED 11111.12,1917,.

l ,229,786 1 Patented June 12; 1917.

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ELECTRIC STOVE.;

APPLICVATIDN FILED JAN.12, 1917.

Patented June 12, 1917.

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JOHN WILLIAMS PURNELL, OF MORRISTOWN, TENNESSEE, ASSIGNOR OF ONE-HALF T0E. B. FISHER, OF MORRISTOWN, TENNESSEE.

ELECTRIC STOVE.

i Specification of Letters Patent. Patented June 12, 1917.

`Application led January 12, 1917. Serial No. 141,993.- I

To all whom it 'may concern.'

vBe it known that I, JOHN WILLIAMS PUR- NELL, a citizen of the UnitedStates, residing at Morristown, in the county of Hamblen, State ofTennessee, have invented a new and useful Electric Stove; and I dohereby declare the following to be a full, clean-:andl exact descriptionof the invention, such as will enableothers skilled in the art to whichit appertains to make and ruse the same.

This invention uis an electric stove to be used for heating -or cookingpurposes.

Its principal object is to provide astove with a supporting structurecast out of tire' proof material and with a supplementary fire proofsupport for the heating element that can be removed from the main sup-'porting structure for cleaning purposes.

Another object of the invention is to provide a support for the heatingelements from. which these elements can be 'removed for cleaning or forrenewal after having beenv broken or damaged.

A third object of the invention is to .proi vide a device of this kindwherein-thev main supporting structure `carries means for attachment tothe electrical'source of supply, so lthat electrical energy can betransmitted to the heating'elements by a system of separableconnections.

As a :fourth object, provision is made for the manual operation of asystem of levers for raising the supplementary supporting structurecontaining the hea-ting element ver-l tically out of the main supportingstructure.

From the structure illustrated in the drawings, practical applicationmay require some deviations, and the right is claimed to make any thatare comprehended in spirit by the appended claims. v

The same numerals of reference designate the same parts throughout theseveral figures, wherein: g

Figure 1 is a plan view of the invention.'

Fig. 2- is a section on line 2 2 of Fig. 1.

Fig. 3 is a section on line 3 3 'of Fig. 1.

Fig. 4 is a section on line 4 4 of Fig. 1.

Fig. 5 is a perspective view of'the end connections for the heatingelement. These connections contact with the connections carried by themain structure.

Fig. 6 is a perspective view of one of the intermediate connectors forthe heating elements.v

f Fig. 7- is a perspective view of one of the bell crank 'levers used inraising the supplementary supporting structure.

The main supporting structure is designed to be cast out of fire clay orsome fire-resisting material, or it may be made out of porcelain. It hasthe longitudinal legs 1 and the end legs 2. On the inside, at a certaindistance below the upper edges, the ledges 3 and 4 are east, and theseledges serve to hold the 'supplementary supporting Vstructure 5. On 'theouter face of one of the legs 1, the studs 6 are attached, theirshoulders 7 abutting the outer face of 1, and their shankspenetrating 1. Set in the inner surface of 1 are the angular connectingstrips 8. These strips are designed to be flush with the linner surfaceof 1, and have holes through which the Shanks of 6 protrudel 'When thenuts 9 are attached tothe Shanks of 6, they hold the studs 6 irmly inpositionon 1, and provide electric contact from 6 to 8. The contactingstrips 8 are embedded in the surface of 1 for substantially their wholelength; the ends remote from 6, however, are bent back on themselvesvforming the U-shaped connectors-lO.

On the end legs 2, slots 11 are formed to provide free movement for thearm 12 of the bell crank levers used for lifting the supplementarysupporting structure 5.' In addition to 12, the bellcrank levers havethe cylindrical ends 13, the studs 14, and the arms 15, as integralparts thereof, and they further have the conical shaped end pieces 16-screwed on to threaded studs 17, which are integral parts of the arms15. Angle plates 18 are attached (one on each side of slots 11) to theleg 2 by the screws 19 and their attendant nuts 20, and the ends ofthese plates are provided with eyes which engage the studs 14 of thebell crank levers and give said levers a pivotal mounting lon the legs2.

The vsupplementary supporting structure 5 has the upturned 'edges 21,22, 'and 23. From each 'of the edges 21 and 22, a series of transverseribs emanate, the ribs 24 of the series emanating from 22 alternatingwith the ribs 25 of the series emanating from 21.. The centraltransverse rib 25a is Wider than its neighbors and is made so as to giveincreased strength to the supple;

mentary supporting structure 5. The 'upturned edges 21, 22 and 23 and,the ribs 2.4. and are integral parts of the suppleinentary supportingstructure-f5. The-ribs eliminating from either Z1 *or -22 approach closeto but do not touch the opposite side, and these ribs, therefore, form aseries (if recesses which so connect as to form a `zig Zag compartmentin 'Which'the heating'el'ements are held. At the #end remote from itsjunction with the upturned edges 21 and 22, any one of 'the "ribs 24 foris straddled at its end Aby an 'intermediate connector for the l-ieatingelements. Each intermediate connector-ccmprisesfthe channel member 26with a post -27frnade-integra'l with its i4flanges. -EachipostihasasholeQS to freceive-an end of--one offtheiheating eiements-anda fscrew 29-for'holdi`rig1said end in firm contact with :said -hoie 0nuboth the ribs 24 landthe -ribs 25 fthe l-free-eifds are undercut and-in this undercut :portion l-of the Y ribs, vthe -webs 30 #of Ithechannel lpieces 26 rest. The `-heatin-g felements I-31 fare placed oneeach -in #the frecess'es form'ed ribs 24 and L25 l*and are electricallyicon nected -in series by -fineans of 'the "intermediate connectors.formed by the channel pieces 26 and --their iattendat binding posts.The two end --heating elements (in the recesses formed by 23 and 211i)'have theirends, which are ladjacent fte fthe-edge 22, connected-to thebindingipcsts 32 offthe angle plates 33. The angle ends of the plates33, ztfterha-ving ,passed lthroughu'ectangular slots 34 (formed -in;tlieup'tur-ned side A22 -zt the -fbcttomofthe -freeesses for-mcd by ribs .24and sides 23) ,engage the :sides 25 on the exterior and are in aposition -to contact With .the U-shaped--eenneetcrs 10.

The supplementary supporting 4*structure 5 has a projecting -ledge -35at-thefbettom of its side 22, 'and this ledge -is fdesigned -fto engagethe ledge 3^0n the back-leg \1 Pand both 3 and 35 are fcut away -at-f-the point where the 'connector |10 is positioned, th'e ledge 35, lso'that --the supplementary supporting struct-ure may --be removed Withoutinterfering with the lconnector 10 and the ledge 3, so that-.the angleconnecting strip 8 may be= easily placed -in -fposition -When thisdevice -is fput in --service, the studs 6 are designed to Vreceive -thecon-ventional felectric attachment plug, which, when connected Withiafsou-rce rof electrical supply, will enable the heating-elementsfl to-be supplied With electric current. 'Beginning at' one of the v studs 6,the` circuit is from the shank of that particularstud Hto itsattend/.int angular connecting strip *8, thence to the `Ushaped--connector which is integral with rthat (particular strip, `r`thence tothe angle .plate 33 "contacting- With rthe connector 10, --thencefthrough the @first -heating element, -thenceone 7of the .intermedi-ate'struc-ture 5, each =being held in position by the overbalancing weightof its conical end piece 16. It is thus -possibleto remove thesupplementary supporting structure lfrom the main structure by anypressure applied to lthe l-a-rms 15, 4--w-hich will operate to -raisethe' cylindrical V'ends L1S-and -with them `sup-v plementary--supporting structure 5. This operation disconnects `the heatingelements fromfthe sou'rce-of-electricalsupply by separatingthe-contacting surfaces of -the angle plates 33 and their U-shapedconnectors 10. The `heating lelements may also lvbe -removed from thesupplementary `supper-ting structure :by disengaging the intermedniteconnectors fro1n the undercut-ends -ofv the transversefribs'andfbytiltingthe angle fplates 33 sufficiently-to disengageithem from theslots 34. It-w-ill be seen tthat the-device as thus separated -into itsvconcomitant parts, which may be readily-cleaned, and, yi-fan-y of theheating 'elements are-broken or damaged-the damaged elements may 'beeasily released from 'the lintermediate connectors \to which 1they arejoined by loosening -thescrews'-29, whereupon --nevv heating --el'ementsmay be substituted.

'Theinvention lhaving been set forth, what is claimed -a-sneW- anduseful is -1. In anelectric stove forcoolring-or heating, f alma-insupporting structure having electrical connectors embedded `in Aitssurface and 'terminating one lend in resilientconnectiensfortransmitting current to-the heating elements, asupplementary supporting structure for-the heating elements, saidsupplementary structure having a series of lribs so --disposed =`as --toform a -zig-z-ag -recess wherein the-heating-elements lie, a series ofheating elements interposed between said ribs, channel shaped connectorsengaging said ribs and electrically connecting lthe heatingelements-angle plate -ccnnectors'for electrically joining the 'heatingelements with the connectors on the main supporting structure, andbell-crank levers pivotally supported on `the Vmain structureand-operaftive's'o as to lift out the supplementary supporti-iigstructure and fther'e'by: disengage'the connections between the heatingelements andthe source of-electrical Isupply.

-2. -In an #electric stove for cooking and heating; the combi-nationWith-a main supportingA structure and la supplementary supporting1structure; -the former having 'electrical connectors attached thereto,the latter having a series of transverse ribs; of a series oi individualheating elements interposed between the ribs; channel shaped connectorsengaging the ends of the ribs and electrically connecting the heatingelements in sequence; and angle plate connectors elec- -tricallyconnecting the heating elements with connectors on the main supportingstructure. Y

3. In an electric stove for cooking and heating; a main supportingstructure having electrical connectors on the inner face of one side,one connector at each end thereof, a terminal contact forming a part ofeach of said connectors; a supplemental supporting structure, providedwith a series of transverse ribs, each alternate rib having its endunattached from the opposite sides of the supplemental structure; aseries of indi vidual heating elements interposed between said ribs;channel shaped connectors engaging the alternate unattached ends of theribs and electrically connecting said heating elements in sequence; andangle plate connectors, one connected to one end of each end heatingelement, thereby electrically connecting the end heating elementsl andsaid ter- Ininal contacts of the connectors on the main supportingstructure.

4. In an electric stove for cooking and heating, a main supportingstructure hav- :ing electrical connectors seated in the inner face ofone side and terminating at one end in resilient connections fortransmitting current to the heating elements, a supplementary supportingstructure for the heating elements, said supplementary structure havinga series of ribs so disposed as to form a JOHN WILLIAMS PURNELL.

Witnesses:

ROBERT A. BoswELL, PHILIP A. H. JEwELL.

Copies of this patent may be obtained for ive cents each, by addressingthe "Commissioner of Patents, Washington, D. C.

